Shojibo takarakt and jtttabo miyamoto



S. TAKASAKI AND J. MlYAMOTO.

SECONDARY COIL.

APPLICATION FILED MAR. 14.1911.

Patented July 29, 1919.

' in operative manner aroun a primary coil.

I Fig. 3 an end elevation showin Uni-ran STATES PATENT OFFICE. v

SHGJ'IRO TAKASAKI AND JUTABO MIYAIO'I'O; OF SHIG-A-KEN,

' snconnmr com Specification of Letters Patent. Patented July 29, 1919,

Application filed 1mm 14, 1917. Serial No. 154,507;

To all whom it may concern: I

Be it known that we, SHOJIRO Taxasaxl,

engineer, a subject of the Emperor of Japan,

and 'resident of No. 104 Oaza Kawahara,

Hikone-Machi, Inukami-Gun, Shiga-Ken,

Japan, -and JUTAno MIYAMOTO, engineer, a subject of the Emperor of Jaan, and a resident of No. 55 ()aza Dobas i, Hikone- Machi, Inukami-Gun,Shiga-Ken, Japan,

have invented an Improvement in Secondary Coils, of which the followingis a specification. i

This invention has for its object to provide an improved secondary coilfor use in connection with induction coils, transformers, or the like.

The specific objects of this invention are to construct a deviceof theabove character which will be inexpensive in manufacture, its sectionscapable of replacement, quickly assembled by a worlnnan of ordinaryskill, I

to provide the minimum protection against breakage of any part of thesecondary coil due to any partial strainin handling the same,and in theevent of such breakage occurring to enable the operator to detect thepoint at which the same has occurred and regime the individual unitdamage:

order that our. invention may be more readily understood we haveappended here to one sheet of drawings in w Figure 1 is a sideelevation. Fig. 2 is a transverse section.

ich z--- a mimber of our secondary coils oupe together Referring moreparticularly to the above figures, it will be seenthat thereferenceletter A represents onevend of the wire used in connection withsecondary. coils from which end the wire extends in the form of a spiralinwardly toward the opening C formed in the plate P. This p ate isconstructed of some good electrical nonconducting material, such astta-percha,

which is normally hard but im er the influence of heat, willbecomefluid. It will be noted that the wire, after having made its innermostturn around the opening G which is provided, for-the reception of theprimary coil, bridges the same as at K and extends in gradually widenedspirals over the other face of the plate C, and at C, terminating in theend B adjacent the opposite end A. In connection with the above it willbe noted that we prefer to arrange the coils D slightly staggeredwithrespect to the coils D, so as to prevent any possibility of a bridgingacross of the current ina thin spot in the plate P;

As aforestated, the plate 1? is preferably formed of a substance similarto guttapercha, which will become lastic under heat, and the preferableway 0 applying the coils to the plate P is to heat the latter until theybecome softened and then apply the wire D and D, pressing the same into.the surface of the plate P which, upon hardening, retains the wires inapplied position.

Having constructed a number of indi-* I of units, each unit comprising adisk of inmaterial formed with an opening.

sulatin throng its center for the rece t1o n of a rimary coil, a sin leiece 0 wire embedded in the faces 0 sai disk and entering the same atits periphery and extending in 'a'dually narrowing spirals to a pointadacent the opening 1n said disk, then bridgmg throu h to the other faceof said disk and exten g in gradually widened spirals to a itionadjacent the outer periphery of said disk' and disks of insulatingmaterial placed between each unit.

2. A secondary coil unit comprising a dlsk of insulating material formedwith an opening through its center for the reception of a pzimary coil,a single piece of wire emdded in thefaces of said disk and entering thesaline at its periphery and extending In testimony whereof we afiix oursignain gradually narrowing spirals to a point tures in presence of twowitnesses.

adjacent the opening in said dfisk, then SHOJIRO TAKASAKI.

bridging through to the other face of said J UTARO MIYAMOTO. 5 disk andextending in gradually widening Witnesses:

spirals to a position adjacent the outer H. F. HAWLEY,

periphery of said disk. 'Tozo OKUBO.

